I've looked at the drawing-artefact of the shadow and my best guess is that it is a texture-coordinate mixup of the XRender-related EXA- drawing. It looks like some texture-coordinate "index" is offset by one in regards to the corresponding quad-vertex. Each shadow-texture is turned clock-wise by 90 degrees.
What could be the cause for the window-border itself to be messed up I currently do not know. That's the best hint I can give right now to anyone being more familiar with the codebase of intel's driver. -- [hardy] Enabling "Normal" effects produces badly drawn window shadows. https://bugs.launchpad.net/bugs/175774 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs